Following the 1999 redistribution, this riding was formed from 40 per cent of Chatham-Kent, about 60 per cent of Lambton, 34 per cent of Middlesex and two per cent of Essex-Kent.

Population: 106,805 (2011 census; a decrease of 0.8% since 2006)

Political history

Incumbent Monte McNaughon once again won the riding for the Tories by 6,956 over Liberal Maria Van Bommel in 2011. Lambton-Kent-Middlesex was first won by McNaughton in 2007 by 4,900 votes over then incumbentVan Bommel. Prior to that election, the riding that been held by the Liberals since 2003.

In 1999, the new Lambton-Kent-Middlesex riding was captured by Marcel Beaubien, former MPP for Lambton, who defeated Liberal Larry O'Neill.

PC candidate Lorne Henderson won elections in Lambton East in 1963 and in Lambton in 1967, 1971, 1975, 1977 and 1981. Liberal Dave Smith won Lambton in 1985 and 1987, and NDP candidate Ellen MacKinnon won in 1990. In 1995, it was won by PC Marcel Beaubien.

In the old riding of Chatham-Kent, Tory Darcy McKeough sat from 1967 until his retirement in 1978. The riding went to the Liberals, NDP and PCs in successive elections.

In the former riding of Middlesex, PC candidate Bob Eaton won in 1975, 1977 and 1981 before losing to Liberal Doug Reycraft in 1985. In 1990, the NDP's Irene Mathyssen defeated Reycraft.

Mathyssen finished third in 1995, unseated by PC Bruce Smith. She later ran in London-Fanshawe in 1997, 1999 and 2003 without success, but finally took the seat in 2006. Reycraft has since gone on to serve three terms as mayor of Southwest Middlesex.

In 1999, Smith ran in the redistributed Elgin-Middlesex-London riding, but lost to Liberal Steve Peters.